| 摘要 |
It is an object to provide an electrically insulating oil composition that can maintain dielectric breakdown voltage high in a wide temperature range of -50°C to 65°C, and can suppress a decrease in dielectric breakdown voltage even in the case of use at high temperature for a long time, and there is provided an electrically insulating oil composition comprising 1,1-diphenylethane and benzyltoluene, wherein the proportion of a para isomer in the benzyltoluene is 45% by mass or more based on a total amount of the benzyltoluene. |
